
a = int (input("您要输入的数："))
b = int (input("请您输入一个数："))
c = int (input("请输入一个数："))

if (a + b <= c or a + c <= b or b+c <=a):
    print("不能构成三角形")
elif (a == b or b == c or a == c):
    print("构成等边三角形")
elif (a*a + b*b == c*c or b*b + c*c == a*a or a*a +b*b == c*c ):
    print("构成直角三角形")
elif (a == b or a == c or c == c):
    print("构成等边三角形：")
else:
    print("普通三角形")